Caster socket



FIG. 1 is a perspective view of a castor socket showing my new design;

FIG. 2 is a front elevational view thereof, the rear elevational view being a mirror image;

FIG. 3 is a side elevational view thereof, the side opposite being a mirror image; and,

FIGS. 4 and 5 are respectively bottom and top views thereof. 

The ornamental design for a caster socket, as shown and described. 